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Comcast Corporation is the largest cable operator, one of the biggest media conglomerates, home Internet service provider, and third largest home telephone service provider in the United States, providing cable television, broadband Internet, telephone service and in some areas home security to both residential and commercial customers in 40 states and the District of Columbia.
The company is headquartered in Philadelphia, Pennsylvania. Comcast also has significant holding in several cable networks, distribution, and related businesses. Comcast acquired a majority stake in media conglomerate NBCUniversal in January 2011. Comcast has been the subject of criticism for activities including its stance on net neutrality, as well as poor results on customer satisfaction surveys.